JPH04116590A - On-vehicle equipment - Google Patents

Abstract

PURPOSE:To enjoy an image of specific input mode simultaneously even when an input mode of only a sound signal is reproduced by selecting an input terminal to which a video signal is connected automatically when the input terminal to which the video signal is connected is selected. CONSTITUTION:Whether or not the video output terminal of other on-vehicle equipment to an input terminal B2 is connected is detected by an external equipment connection detecting circuit 3 for the input terminal B2 and the detection result is sent to a microcomputer 4. The microcomputer 4 processes the information and information on the kind of the input terminal according to a flow chart. A video input switching circuit 5 is controlled according to the result and an input to a video processing circuit 6 is switched. The software program of the microcomputer 4 is so written that when the video output terminal is not connected to the input terminal B2, a video input switching circuit 5 is controlled to pass an input signal to an input terminal A1 if the input terminal B2 is selected. Consequently, even when the input mode of only the sound signal is reproduced, the image of the specific input mode is reproduced at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mains equipment having a plurality of video signal input terminals.

[Conventional technology]

Previously, regardless of whether a TV or video was connected, selecting a TV would change to the TV screen, and selecting a video would change to the video screen. Therefore, if no television or video equipment is connected to the input terminal of the selected mode, nothing will be displayed on the screen.

[Problem to be solved by the invention]

In the above conventional technology, even when the video is not connected,
If you select video, it will be a video input and nothing will be displayed on the screen.

An object of the present invention is to make it possible to simultaneously enjoy the video of a specific input mode even when playing back an input mode of only an audio signal with no video, such as a compact disc.

[Means to solve the problem]

In order to achieve the above object, a switch is used that becomes conductive when the video output terminal of another main equipment is connected, and the video input signal is selected based on the signal.

[Effect]

If the video output terminal of another main device is not connected to an input terminal other than a specific input terminal, the video output terminal connection detection circuit for that input terminal will detect that there is no connection, and the input terminal will be connected to that specific input terminal. The input switching circuit is controlled to select the video signal.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The external device connection detection circuit 3 to the input terminal B2 detects whether the video output terminal of another in-vehicle device is connected to the input terminal B2.
is detected and sent to microcomputer 4.

The microcomputer 4 processes this information and the information on the type of the selected input terminal according to the flowchart shown in FIG.

According to the result, the video input switching circuit 5 is controlled to switch the input signal to the video processing circuit 6. Here, as shown in the flowchart, the software program of the microcomputer is configured so that when the video output terminal is not connected to the input terminal B2 and the input terminal B2 is selected, the video input signal is passed through the input terminal A1. It is constructed to control the switching circuit 5.

[Effect of the invention] In an in-vehicle device that has multiple video signal input terminals, if no video output terminal of the other in-vehicle device is connected to an input terminal other than a specific input terminal, the signal of that specific input terminal is Select automatically.

With this new function, it is now possible to simultaneously play back video from a specific input mode, even when playing back an audio signal-only input mode with no video signal, such as a compact disc.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is an operation flowchart of the microcomputer.

Claims (1)

[Claims] 1. When an input terminal to which a video signal is connected is selected in an in-vehicle device that has multiple video signal input terminals,
An in-vehicle device that automatically selects the input terminal to which a video signal is connected.